The results from causal analysis provide a clear distinction between different types of hallucinations: brittle and robust. Brittle Hallucination: The hallucination is "brittle" if the model can be easily nudged back towards the correct answer. This happens when the true emotion's knowledge is present internally but is overshadowed by a stronger, albeit incorrect, signal at the final layer. Robust Hallucination: The hallucination is "robust" if adding noise does not correct the model's output. This suggests the error is deeply ingrained and not easily corrected by a simple intervention at the embedding layer. The model may have genuinely lost or mislearned the information needed for the correct output.